Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
DNA is a molecule that contains the instructions an organism needs to develop, live, and reproduce. It is composed of two long strands forming a double helix structure, where sequences of four types of nucleotides encode genetic information.
The basic building block of DNA and RNA, consisting of a sugar, phosphate group, and one of four nitrogenous bases.
Genes: Segments of DNA that contain the instructions for the synthesis of proteins, which determine the physical and biochemical traits of an organism.